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authorNicholas Roth <nicholas@rothemail.net>2022-10-30 18:04:56 -0500
committerJacopo Mondi <jacopo.mondi@ideasonboard.com>2023-10-18 13:06:44 +0000
commita7103ced3a6d9c56df839b1f2eab0780c56674f7 (patch)
treec43a2e01d60aef725baed4391f72c463021b682c /include/android/hardware
parentbeaffa59a04ebabf17dee7b329ab570da14651b8 (diff)
ipa: workaround libcxx duration limitationjmondi/android/vndk
A bug in libcxx [0] used by clang version 11.0.2 is prevalent when building libcamera for Android SDK30. This has been fixed and integrated upstream with [1]. As a workaround, directly cast libcamera::utils::Duration objects to std::chrono::duration when dividing. Alternatives evaluated: Considered: Enable public inheritance of std::chrono::duration and override operator/ in the class. Outcome: Does not fix the original compiler error. Considered: Enable public inheritance of std::chrono::duration and override operator/ in the libcamera namespace. Outcome: new compiler error: ld.lld: error: duplicate symbol: libcamera::operator/ (libcamera::utils::Duration const&, libcamera::utils::Duration const&) Considered: Use private inheritance of std::chrono::duration and re-implement a pass-through version of each std::chrono::duration operator within libcamera::utils::Duration and use template metaprogramming to fix the division operator. Outcome: Testing shows that this would introduce substantial limitations, i.e. requring the Duration object to be on the LHS of any arithmetic operation with other numeric types. This also substantially increases implementation complexity. Considered: Extract double values from libcamera::utils::Duration objects and use those to divide. Outcome: This creates substantial readability and unit-safety issues. [0] https://github.com/llvm/llvm-project/issues/40475 [1] https://github.com/llvm/llvm-project/commit/efa6d803c624f9251d0ab7881122501bb9d27368 Bug: https://bugs.libcamera.org/show_bug.cgi?id=156 Signed-off-by: Nicholas Roth <nicholas@rothemail.net>
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